Design for broadband high-efficiency grating couplers

Optics Letters
Zhe XiaoPing Shum

Abstract

In this Letter, we propose general optimization methods to design broadband high-efficiency grating couplers for planar waveguides. We attribute the coupling bandwidth to the mismatch of effective indices between the diffracted beam and the actual grating structure around the operation wavelength for fiber to waveguide excitation. The coupling bandwidth formula is deduced. A simple parameter-separate optimization procedure is proposed for general layered grating couplers for high coupling efficiency. Using our principle, we optimized a grating coupler for a horizontal slot waveguide operating at wavelength 1.55 μm for TM polarization. The grating coupler has 1 dB bandwidth of 60 nm and coupling efficiency of 65% with incident light from single-mode optical fiber (SMF) at 8°.

References

Jun 24, 2004·Optics Letters·Vilson R AlmeidaMichal Lipson
May 5, 2009·Optics Letters·Robert HalirJuan G Wangüemert-Pérez
Nov 27, 2006·Optics Express·Günther RoelkensRoel Baets
Dec 15, 1990·Optics Letters·I A AvrutskyO Parriaux

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Citations

Feb 2, 2017·Optics Letters·R A LarreaP Sanchis
Nov 6, 2013·Nature Communications·Haiming YuD Grundler
Oct 16, 2015·Optics Letters·Yun WangNicolas A F Jaeger
Mar 14, 2013·Optics Express·Zhe XiaoFeng Luan
Dec 22, 2012·Optics Letters·Zhenzhou ChengHon Ki Tsang
Jul 14, 2018·Optics Letters·Purnima SethiShankar Kumar Selvaraja
Dec 13, 2019·Scientific Reports·Siddharth NambiarShankar Kumar Selvaraja

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